USB is an interface technology applied to personal computer, which is true plug and play. Its full name in English is universal serial bus. It was first launched in 1995, accompanied by the development of Intel Pentium. Since Microsoft supported USB interface to Windows 98, USB interface has been popularized and USB devices are also increasing, such as digital cameras, scanners, game sticks, printers, keyboards, mice etc., among which cameras and USB disk are the most widely used.
What do you think USB looks like? Is this it?
Then do you recognize this?
How about this one？Do you know its name?
If you know them all, I bet you must be an expert in this field. If you don't know, you might as well have an in-depth understanding of USB with me, which may be helpful to you.
How many USBs are there? Answer: according to the appearance, there are three USB interfaces, namely type-A, Type-B and Type-c. USB A type and USB B type can be divided into standard type-A, mini type-A, micro type-A, standard type-B, mini type-B and micro type-B according to their shapes.You can identify different USB types by this picture.
Among them, type-A is the most commonly used, and mini-A and micro-A have almost been eliminated; Type-B is usually used to connect printers and is still widely used. Type-C is also a widely used USB at present.More and more electronics devices, like Apple Mac,Huawei mobiles,adopt USB C now.type A and type C are usually use in our docking station,HD cable and converter to meet the needs of different usage scenarios.
USB can also be divided into USB1.1, USB2.0 and USB3.0 according to the transmission speed.
The maximum transmission rate of traditional USB 1.1 is 12mbps. Generally, manufacturers call their products that meet the USB 1.1 standard "full speed USB". Although USB 1.1 has a data transmission rate of 12mbps, it is often only about 1mb/s in actual, which is only suitable for low-speed devices such as printers and scanners. The maximum transmission rate of high-speed USB 2.0 was only 240mbps when it was first launched. Later, the USB2.0 promotion group increased the rate to 480mbps in October 1999, 40 times faster than the traditional USB 1.1. USB 2.0 actual data transmission rate has reached more than 20MB / s.The maximum transmission bandwidth of USB3.0 is up to 5.0gbps (500mb/s).The bandwidth of 5Gbps is not 625mb/s obtained by dividing 5Gbps by 8, but adopts the same 10 bit transmission mode as SATA (a pair of error correction codes are added on the basis of USB2.0), so its full speed is only 500MB / s.
So how should we choose when we buy such products? If you are interested, you can click on the title to learn more.
